Coating machine



Nov. 6, 1934. 1,5 HADAWAY 1,979,262

COATING MACHINE Filed Jan. 14, 1951 2 Sheets-Sheet l Fig.1.

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M imam Nov. 6, 1934. J. B. HADAWAY COATING MACHINE Filed Jan. 14, 1931 2 Sheets-Sheet 2 m m V 1 a N M T Mhm Patented Nov. 6, 1934 res PATENT v OFFICE 1,979,262 COATING MACHINE John B. Hadaway, Swampscott, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a, corporation of New Jersey Application January 14, 1931, Serial No. 508,717

21 Claims. (Cl. 91-51) This invention relates to .machines by which a coating, as of latex or other adhesive substance, may be applied to a work-surface, it being of a character; similar to the invention disclosed in 5 greater detail in an application in my name for improvements in Coating apparatus, filed in the United States Patent Office of even date herewith,-* Serial No. 508,716, and which is in some u respects generic to the present invention dis- 10- closed herein. The machine of this application is especially designed for operating upon such articles as lifts for the heels of shoes. "The lifts of shoe-heels have their peripheries at the rear of the breast-corners curved upon widelydifierent radii. The extreme rear portion is quite sharply curved, while the sides are much flatter. When the curved margin of one face of such an-article is to be coated by rotatable memv bers, as rolls, a relation between work-engaging QO surfaces which properly acts upon a lift at one portionof the margin will not so act at another. That is, a feed-roll, so tapered that it will satisfactorilyi turn the work at the portion of short I radius, will resist at its reduced end the advance 26 at the less curved portion, this causing undue Wear upon the more slowly traveling section of the roll-periphery and possible injury to the lift surface as it is forcedunder the roll, 'An object of my invention is to provide for effectively turning the work at the points where the change of direction is most rapid and yet avoid the inju rious action upon the work and the work-engaging elements of the machine where the change is more gradual. I accomplishthis by combining two rotatable work-engaging members, preferably in the form of rolls, one of which is conical or differing in diameter. A work-engaging portion of said conical member, as that of smaller diameter, is movableindependently of another if or larger work-engaging portion thereof. This independence permits the first-mentioned rollportion to accommodate itself to the rate of travel of the Work-area with which it is in contact.

To give the independently movable portion also (51a feeding effect upon the work, I have provided means forresisting its independent movement.

In the accompanying drawings are illustrated a particular embodiment of my improved coating machine and a modification thereof, 50 3 Fig. 1 being a side elevation of the machine withparts broken away;

Fig.2, an enlarged side elevation of the workengaging rolls with portions in section;

Fig. 3, a vertical sectional detail through the 65 feed-rollon a still larger scale;

Fig. 4, a broken end elevation looking from the left in Fig. 1;

Fig. 5, a perspective view of the applying roll and its scraper;

Fig. 6, a top plan view of an applying roll and scraper differing in form from that of the preceding figures; and

- Figs. 7 and 8, perspective views of heel-lifts coated, respectively, by the arrangements of Figs. 5 and 6.

In the upper portion of a frame 10 adapted, as illustrated, to be supported upon a bench, is journaled a horizontal shaft 12 rotated from a main driving shaft 14 by spur-gearing 16. At its forward extremity, the shaft 12 acts through bevel -gearing 18 to rotate in theframe a downwardly and outwardly inclined tubular shaft 20 carrying, at its lower end, a roll R. This roll is generally conical in form, decreasing in diameter outwardly, but preferably with its apex omitted, being, therefore, frusto-conical. It is shownas formed in two sections-a body-portion 22 of greater diameterfast upon the shaft 20 and a smaller'terminal portion 23 rotatable by frictional engagement with the body. This arrangement will later be described in detail. The roll R is one of a pair of work-feeding and pressurerolls, the companion roll 24 of the pair being also frusto-conical, converging outwardly, but with a relatively slight taper, its periphery being much more nearly cylindrical than that of the roll R. It is secured upon the outer extremity of a shaft 32 turning in an arm 34 pivoted at 36 upon the frame. *A chain of spur-gears 38 connects the shaft 32 to the shaft 12, so the rolls R and 24 are rotated in opposite directions to advance the engaged work from right to left (Fig. 4). The driving connections and diameters of the conical surfaces are such that opposite points at the bases or larger work-engaging ends of the frusta travel at approximately the same speed. The roll R, being fixed against bodily movement, acts as an abutmentand feed-roll, while the lower roll 24 serves both to support the work and to apply a coating substance thereto, and may be yieldable by virtue of the movement of the arm 34 about its pivotal mounting. This yield is, in the present instance, against the resistance of a spring 40 interposed between a depending portion 42 of the arm 34 and a screw 44 threaded horizontally into the frame. The spring surrounds and is retained against lateral displacement by a rod 46 pivoted to the arm-portion 42 and guided in a bore in the screw. Said screw is adjustable in position, to allow the expansive force of the spring to be varied, by a hand-wheel 48. The normal space between the work-engaging surfaces of the rolls R and 24 may be altered by an adjustable stopscrew 50 mounted for vertical movement in the frame, and against which the spring urges the arm 34. As illustrated, the screw is threaded into a bushing 52 in the frame, and may be turned by a hand-wheel 54 splined upon the upper end of the screw and with its notched underside normally held by a spring 56 against a retaining projection 58 upon the frame. A screw 60 carried by the frame may also receive contact of the arm 34 for the purpose of so limiting the upwardv level from a container 64 by barometric feed. At'

the outgoing side of the rolls, the trough is provided with a cover 66 which protects the contents from dirt, this cover curving upwardly at 68 beside the outer end of the roll24. At the incoming side of the rolls, a curved member '70 supports the work as it is presented to the rolls, guards the lower roll and covers this end of the trough. It has an upstanding wall '72 angularly related to the member 70 and adjustably secured by a screw 74 passing through a verticalslot in adepending arm of a bracket 76, which is, in turn, attached to the arm 34 by a screw '78 situated in aho'rizontal slotin the bracket. A portion ofthe wall 72 lies adjacent to the inner ends of the rolls R and 24, serving as a gage, to maintain the Workin the correct relation to the rolls to receive its coating To give uniform transverse contact with the edge of the work, the, gageportion'SO preferably lies substantially at right angles to. a line at the bite of the rolls, It-is shown as separable from the wall, so it may be replaced .when'worn. The connection74 allows the work-support '70 to be positioned at the desired height'with respect to the top ,of the apply.-

.. ing' roll 24', and theangular relation of both thesupport and gage to be changed. The connectionprotected by a curved guard 82 having a vertical stem joined to the frame-by a tongue-and groove connection witha bar screwed to the cover'for the gears 18 and adjustably held by a slot-andscrew connection 84, by which the distance of the guard 82 from the lower supports and guards may be varied. ,From this upper guard is a projection 86 above themember 70, the lower surface of which projectionis downwardly and forwardly inclined. With thecurved' surface of the member.

'70, this furnishes a throat which facilitates the introduction of work-pieces between the rolls.

The applying surface of the roll 24 preferably has closely placed small pockets ordepressions to receive the adhesive, which is transferred therefrom tothe workwhen the roll is pressed against it- This surface is sufficiently close to a cylinder so the extent to which it dips into the adhesive in the trough'62 is not very different at its ends,

and, therefore, the supplying'o'f the adhesive to the entire applying surface of the-roll is made ration between the layers.

as will be described. In operating upon heellifts H, for example, one may wish to apply, as illustrated in Fig. '7, a zone S of the adhesive about the curved margin, this being interrupted near its edge by an uncoated band. s. This arrangement causesthe lift and a rand assembled with it to be held firmly together at the periphery, so there will be, to the purchaser of such heels, noappearance of checking or tendency to sepa- Yet, when the heel is trimmed, after attachment, to a depth entering theuncoated band 8, no adhesive will appear at the surface to impair the finish, and there will be no evidence of separation between the lift and rand, on account of the compressing operation to Which'the heel has been subjected. This effect is obtained by providing in the applying surface of the roll 24 a groove 90, from which the adhesive isremoved before the work is reached by the side of the roll rising from the trough 62. The preferred form of the bottom of this groove is inclined outwardly with respect to the axis toward the'inner end of the roll or that of greater diameter (Fig. 2), the incline terminating at 92, substantially at the applying surface. Thiscauses the bottom of the grooveto present a frustoconical surface ofsomewhat more abrupt-taper than that of the periphery of the roll, it merging into said periphery. This last-mentioned relation avoids the formation of a sharp angular shoulder in the roll at the side of the groove toward the gage, and consequently eliminates the resistance which would be offered by sucha shoulder to the holding of the work toward the gage.

To dispose of the excess of theadhesive substance which is brought up by the roll 24- from the trough, and to clean the groove 90, a scraper,

is provided. This is shown in Fig. 5 asconsisting of a plate 94 lying in agenerally horizontal plane and substantially opp ositethe axis of the roll. The plate has an inclined edge 96 parallel and in close proximity to the pocketed applying surface, and an angular projection 98 from saidedge entering the groove. The portion 96 may remove from the periphery of the roll practically all the adhesive except What is contained in the-pockets,

while the portion 98 so cleans the groove that it Willlay no coating upon the work. From the plate, at each side of the edge 96, is a curved projection 100 lying close to the end of 'theroll. These projections prevent the adhesive from working along the ends of the roll and gathering about the supporting shaft, The curvature of the projections causes the adhesive to be deflected downwardlyallowing it to fallclear of theends of the roll. The plate 94 is adjustably secured by a slot-and-screw connection 102 to the flattened surface of a rod 104 extending through ahorizontal opening in a pivoted holder or support-106, being normally fixed against movement in the opening by a set-screw 108 (Fig. 1). The pivotal mountingof the holder is furnished by a hori-.

zontal spindle 11G supported in lugs 112,112 (Figs 1 and 4) upon the arm 34, this spindle passing through depending portions of the holder and of a horizontal extension 114 thereof. A screw 116 extends through an opening in an upwardly projecting lug of the holder 106, and is threaded into the arm 34. A spring 118, interposed between the arm and holder-lug, urges said lug against the head of the screw, the adjustment of the latter determining the approach of the edge-96 ,of the scraper to the roll 24, and therefore the extent towhich the-adhesive is removed from the applying surface. A stop-screw 120, threaded through holder.andcontactingwith the arm, fixes the minimum spacing between the roll and scraper. The alteration in the position of the rod 104 and of the scraper -upon said rod provides initial adjustments of the scraper transversely of and to- Wardand from the roll. If the application of an uninterrupted zone of adhesive is desired, this being as appears in Fig. 8, the applying roll 24 will have a continuous pocketed peripheral surface, and the edge 96 of the scraper-plate 94 will be unbroken. This arrangement is illustrated in Fig. 6.

Returning to the feed-roll R, (Figs. 2 and 3), theupper, section 22 includes the portion of the frustum of greater diameter, and is shown as integral with the tubular shaft 20, it being, therefore, continuously rotated by the gearing 18. Against the plane-surface upon the smaller end ofthe section 22 bears a like surface of the larger extremity of the roll-section 23. It is there retained by the flanged head of a screw 140 threaded into the lower. enlarged end 141 of a spindle 142 passing through the shaft 20. Adjacent to its head, the screw has a smooth cylindrical surface 143, about which the roll-section 23 may turn. The freedom with which'the section; 23 is to rotate independently of the section 22 :depends upon the peripheral contour of the work to beoperated upon, the section 23 applyingthereto more or less feeding eifect,de-

pending upon whether the edge of the work is more or less curved. An. angul-arportion 144 of the spindle 142 so engages the interior of the shaft 20 that it'is .compelled to turn therewith, while being independently longitudinally 'movable. Surrounding the spindle and abutting at its lower end against a shoulder upon the interior of the shaft 20 is a helical spring 146, the upper. extremity of which contacts with a sleeve 148 threaded upon the spindle and provided outside the shaft with a head 150 by which it may be turned; Thus may be varied the degree of compression of the spring and the force which it exerts to raise'the spindle and press the surface of theroll-section 23 against the opposed surface of the section 22. This alters the resistance required to cause the section 23 to slip while being driven by its frictional engagement with the companion section. Both rollsections are shownas stepped, and eachof the peripheral, surfaces upon these steps is toothed.

There are thus furnished separated series of pro-' tively slight curvature, the roll R for such anoperation will have a slant-height or distance along an element of the full cone from its apex to the base less than the radius of curvature of the edge E. of the lift.- Under these conditions, the roll will not only feed the work in a curved path, because of the varying speed of rotation ofdifferent zones of the :rolls longitudinally'of the peripheries, which speed increases toward the bases, but the roll R will have a' tendency to hold the work against the gage and, due to the more effective engagement of its toothed surface, will overcome any opposite tendency of the roll 24. The operator advances the breast-corner C of the lift over the support '70, along the gage and between the rolls R and 24, the latter roll being depressed against the action of the spring 40. Because this initial portion 2 of the lift-edge is of slight curvature, the work must first advance in nearly a straight line. Obviously, as the feed-roll R decreases in diameter toward the apex and its speed of rotation correspondingly decreases, if said roll were solid, the rate of travel of the work and the work-engaging surface of the outer portion of the roll would differ widely. This would result in both a rapid wear of the terminal-portion of the roll and a mutilation of the work-surf-ace. The force of the spring 146 is, however, so adjusted by the position of the sleeve 148 that the section 23 may slip, remaining substantially at rest while a side 2 is being operated upon, while the more rapidly rotating section 22 accomplishes the feeding in the desired slightly curved path. When the rear portion E of the lift is reached, the rate of trav e1 of the work, decreasing from the edge inward, and the speed of rotation of the conical surface of the feed-roll R, tapering inwardly toward the center of the lift, will not be very different, and the friction between the contact-surfaces of the sections 22 and 23 will be sufiicient to cause said sections to rotate together. The entire workengaging surface of the roll R is consequently active in turning the lift and urging it toward the gage 80. After the portion E has passed between the rolls and the other side e reaches them, the roll-section 23 again slips upon the companion section, to compensate for the increased rate of advance of the inner area with which the section 23 contacts. At the opposite breast-corher 0, the lift is ejected fromthe rolls. During this passage between the rolls, the applying surface of the roll 24, cleaned of the excess of adhesive by the scraper 94, presses upon the under surface of the lift such of said adhesive as may be contained in the roll-pockets. Depending upon the absence or presence of the groove 90 in the roll 24 and the corresponding conformity of the scraper-edge, the area operated up on by the applying surface will or will not be fully coated.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a coating machine, in combination, a pair of rotatable work-engaging members, one of which is conical and is divided into sections, and means for driving said sections which permits one work-engaging section of said conical member to slip slightly with respect to another work-enga ing section thereof.

2. In a coating machine, in combination, a pair of rotatable members having work-engaging portions of different diameters, a work-engaging portion of smaller diameter on one member being movable independently of a larger work-engaging portion of said member, and means to urge one portion into contact with the other portion.

1 3. In a coating machine, in combination, a pair of rotatable work-engaging members, one of which is conical and has independent portions, a work-engaging portion of smaller diameter of said conical member being movable independently of and adapted to slip with respect to another workengaging portion thereof, and friction-producing means interconnecting said portions.

4. In a coating machine, in combination, a pair of rotatable work-engaging members, one of which is conical, a work-engaging portion of said conical member being movable independently of another work-engaging portion thereof, and means for resisting such independent movement.

5. In a coating machine, in combination, a pair of 3 rotatable work-engaging members, one of which is conical, a work-engaging portion .of said conical member being movable independently of another work-engaging portion thereof, means for resisting such independent movement, and means arranged to vary the resistance.

6. In a machine for coating heel-parts, in combination, angularly related driven shafts, and a pair of rotatable work-engaging rolls on said shaft, one of said rolls being conical and mounted adjacent to the outer end of its shaft, a portion of said conical roll nearer the adjacent end of the shaft and adapted for engagement with an inner area of a heel-part being rotatable independently of a roll-portion larger than the other portion and engaging such heel-part toward its periphery.

7. In a machine for coating heel-lifts, an edge gage for coaction with the periphery of a lift, a coating roll, and a driven frusto-conical feed roll opposite said coating roll and having a body-portion arranged for engagement with the surface of a lift adjacent to the periphery thereof where it contacts with said gage and a smaller portion movable independently of the body-portion and arranged to engage saidlift-surface at points removed from the periphery and the gage.

8. In a coating machine, a rotatable shaft, a work-engaging roll fast upon the shaft, a rollsec'tion rotatable independently of the fast section, and a spring arranged to force the independently movable section into contact'with the fast section. v 7

9. In a coating machine, a rotatable shaft, a work-engaging roll fast upon the shaft, a rollsection rotatable independently of the fast section, a spring arranged to force the independently movable section into contact with the fast section, and means arranged to vary the force of the spring.

10. In a machine for coating heel-lifts, a rotatable shaft, a roll-section fast upon the shaft and arranged for engagement with a surface of a lift adjacent to the periphery, a roll-section rotatable independently of the fast section and arranged for engagement with an innerportion of the lift,and a spring arranged to force the independently rotatable section into frictional contact with the fast section.

11. In a coating machine, a tubular shaft, means for rotating said shaft, Work-engaging rollsections rotatable by the shaft, and means situated within the shaft for forcing the roll-sections into frictional engagement.

12. In a coating machine, a tubular shaft, means for rotating said shaft, work-engaging rollsections rotatable by the shaft, means for forcing the roll-sections into frictional engagement, and means extending within the shaft for varying the force of such'engagement.

13. In a coating machine, a tubular shaft, means for rotating said shaft, a work-engaging roll having a section secured upon the shaft, a spindle movable longitudinally of the shaft and rotatable therewith, and av roll-section rotatable about the spindle and contacting with the companion section. V

14. In a coating machine, a tubular shaft, means for rotating said shaft, a work-engaging roll having a section secured upon the shaft, a spindle movable longitudinally of the shaft and rotatable therewith, a roll-section rotatable about the spindle and contacting with the companion section, and a spring surrounding the spindle and acting to maintain such contact.

1 5. In a coating machine, a-tubular "shaft, means for rotating said shaft, 2. work-engaging r011 having a section secured upon the shaft, a spindle rotatable with the shaft and movable longitudinally thereof, a roll-section rotatable about the spindle and contacting with the companion section, a spring surrounding the spindle and contacting with the shaft, and a member variable in position upon the spindle and receiving contact of the opposite end of the spring. 1

16. In a coating machine, a tubular shaft, means for rotating said shaft, a Work-engaging roll having a section secured upon the shaft, a spindle rotatable with the shaft and movable longitudinally thereof, a roll-section rotatable about the spindle and contacting with the companion section, a spring surrounding the spindle and contacting with the shaft, and a sleeve threaded upon the spindle and extending into the shaft to receive contact of the opposite end of the spring.

17. In a coating machine, a coating roll, a cooperating frust-o-conical pressure roll comprising independent roll. sections, -means for positively driving one of said r-oll sections, and means for frictionally driving the other roll section.

18. In a coating machine, a frustd-conical coating roll, -a cooperating frusto-conical pressure roll having independent roll sections and positioned above the coating roll, and means for driving said r011 sections having a positive connection to one section and'a'controllable frictional connection to the other section.

19. In a coating machine, a work-supporting roll, a cooperating roll comprising a plurality of sections, a driven shaft positively rotating one of said sections, another roll section rotatable with respect to the first section, a headed spindle slidably engaging said shaft with the head of the spindle adjacent to the second section, means acting upon said spindle to draw the head into frictional engagement with the second section,

and means for forcing the spindle to rotate with,

cal, one Work-engaging portion of said conical member being movable independently of another work-engaging portion thereof, a hollow shaft connected to one work-engaging portion, a headed spindle within said shaft holding the other portion in frictional engagement with the first, a

spring within the shaft urging the spindle into engagement with the roll portion, and an adjustable abutment for said spring to control its tension.

JOHN B. HADAWAY. 

